It can definitely be security related. The exact minimum set of permissions needed for users to successfully use the AWS Console is byzantine and not well documented. AWS managed (example) policies tend to just grant "* on *" type permissions.

To carve out minimal permissions, you have to start with nothing and repeatedly attempt to do the action in AWS console, and check CloudTrail to see what got denied. Increase role permissions, lather, rinse, repeat until it works and pray they don't update the console and break you again.

It's possible that either this process is too tedious to be worth doing, or produces a policy more complicated than they wish to use, or requires a policy that is more permissive than they wish to use.